docs: address changes in topology management

Summary

• rpc_api.md: remove .proc_replication_promote
• rpc_api.md: remove Replicated state
• rpc_api.md: edit .proc_replication arguments

Address changes from picodata@0a8f88d2

picodata 24.5.0-350-g0a8f88d2

---

• Part of #336 (closed)
• Cherry-pick to: none
• Staging:
  • ../architecture/rpc_api/
  • ../architecture/rpc_api/#proc_replication
  • ../architecture/topology_management/#replicaset_master_switchover
• Follow-up for picodata!1235 (merged)